The Render Settings logic has changed a bit. To find the settings you will need to go to "Windows->Lighting" and go to the Scene tab, There you will find the Ambient & Fog settings as well as some new features.
ref: http://answers.unity3d.com/questions/841957/editscene-render-setting-menu-missing-in-unity-5.html
unity5 where is "Edit->Render Settings"?
原文：http://www.cnblogs.com/wantnon/p/4359398.html